Method and device for enabling or disabling gap in relation to random access procedure in wireless mobile communication system

A terminal in a wireless communication system, the terminal comprising:

• a transceiver configured to transmit and receive a signal, and
• a controller configured to control the transceiver to:
• receive from a base station a RRCReconfiguration, the RRCReconfiguration includes a ServingCellConfig for Special Cell (SpCell) and a gap configuration information, the ServingCellConfig includes n bwp-Id and n BWP-DownlinkCommon and n+1 BWP-DowmlinkDedicated, the n+1 BWP-DowmlinkDedicated optionally includes Type2GapStauts, one BWP-DowmlinkDedicated of the n+1 BWP-DowmlinkDedicated is not associated with a bwp-Id and includes configuration information of initial Bandwidth Part (BWP), the gap configuration information includes gap length information and gap offset information and gap periodicity information, and
• initiate a random access procedure and activating or deactivating the gap by the terminal,
• wherein the gap is activated if Physical Random Access Channel (PRACH) occasion is not configured for a second uplink BWP and BWP-DownlinkDedicated of a first downlink BWP includes Type2GapStatus and the Type2GapStatus indicates a first value,
• wherein the gap is deactivated if PRACH occasion is not configured for the second uplink BWP and BWP-DownlinkDedicated of the first downlink BWP includes Type2GapStatus and the Type2GapStatus indicates a second value,
• wherein the first downlink BWP is initial downlink BWP of the SpCell and the second uplink BWP is active uplink BWP when the random access procedure is initiated,
• wherein, if the gap is activated, the terminal during the gap transmits a first uplink shared channel (UL-SCH) and does not transmit a second UL-SCH, and
• wherein the first UL-SCH is UL-SCH for transmission of Msg 3 or MSGA payload and the second UL-SCH is UL-SCH that is not the first UL-SCH.